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  2. Package redirection scam - Wikipedia

    en.wikipedia.org/wiki/Package_redirection_scam

    A package redirection scam is a form of e-commerce fraud, where a malicious actor manipulates a shipping label, to trick the mail carrier into delivering the package to the wrong address. This is usually done through product returns to make the merchant believe that they mishandled the return package, and thus provide a refund without the item ...

  3. Registered mail - Wikipedia

    en.wikipedia.org/wiki/Registered_mail

    Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made. Depending on the country, additional services may also be available, such as:

  4. Greylisting (email) - Wikipedia

    en.wikipedia.org/wiki/Greylisting_(email)

    Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after a delay, and if sufficient time has elapsed, the email will be accepted.

  5. DMARC - Wikipedia

    en.wikipedia.org/wiki/DMARC

    SPF checks that the IP address of the sending server is authorized by the owner of the domain that appears in the SMTP MAIL FROM command. (The email address in MAIL FROM is also called the bounce address, envelope-from or RFC5321.MailFrom.) In addition to requiring that the SPF check passes, DMARC checks that RFC5321.MailFrom aligns with 5322.From.

  6. Return address - Wikipedia

    en.wikipedia.org/wiki/Return_address

    Envelope with return address in top left corner. In postal mail, a return address is an explicit inclusion of the address of the person sending the message. It provides the recipient (and sometimes authorized intermediaries) with a means to determine how to respond to the sender of the message if needed.

  7. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    A single misplaced letter could cause a delivery failure. If the message keeps getting bounced back, make sure the account is closed or hasn't been moved. Each delivery failure message will provide info on when the original email was sent ("Arrival-Date"), the reason for the failure ("This user doesn't have a aol.com account (XXX123@aol.com ...

  8. Nixie (postal) - Wikipedia

    en.wikipedia.org/wiki/Nixie_(Postal)

    In the early 21st century the word began to be printed in the upper left corner of yellow labels generated by the USPS's Postal Automated Redirection System (PARS). With the advent of e-mail messages, the term receives wider use, and address changes are registered in what may be called the "Nixie list". [citation needed]

  9. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The next batch of numbers (200) represent the area code. The regional, district and area codes come together to form the postcode. The last batch of numbers (1987) represent the unique address of the location. A combination of the postcode and the unique address make up the digital address. [7] Gibraltar: GI: GX11 1AA Single code used for all ...